Yes, matter is conserved during the reactions between glucose and nitrogen compounds to form amino acids. This is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.
In these reactions, the atoms present in the reactants (glucose and nitrogen compounds) are rearranged to form the products (amino acids). The total number of atoms of each element in the reactants will equal the total number of atoms of that element in the products. Therefore, while the structure of the molecules changes and new substances are formed, the overall amount of matter remains constant, confirming that matter is conserved throughout the reaction.